An individual who always roots against his friends' favorite teams, and roots for all the teams his friends hate. Just to be a little bitch. He has little to no sports knowledge of the teams he is rooting for, and probably cannot name 5 players on the team. It's just to get people riled up, and to be contrary for no apparent reason.

The individual is similar to a bandwagon fan.

Guy 1- Did you hear Jessi is rooting for the Pittsbugh Penguins to win the Stanley Cup?
Guy 2-.... He's from Detroit... What a Sport's Whore.